|There's a useful little tool called 'Complete Internet Repair'. Available here:|
It's free and works in a lot of cases. Don't just click every box, look at what each does and see if it's relevant. For something like this issue the top 4 options are a good start. I've used it a number of times where it's had me tearing out the little hair I have left..
"I've always been mad, I know I've been mad, like the most of us..." Pink Floyd